LowFile-scopeC# Plug & play

Extract common query logic

Factor repeated LINQ predicates/projections into reusable expressions or methods.

Why this matters

Improves readability and ensures consistent filtering/mapping.

Side-by-side examples engineers can pattern-match during review.

Avoid

var q1 = ctx.Users.Where(u=>u.Active && !u.Deleted);
var q2 = ctx.Admins.Where(a=>a.Active && !a.Deleted);

Prefer

Expression<Func<IHasFlags,bool>> active = e => e.Active && !e.Deleted;
var q1 = ctx.Users.Where(active);
var q2 = ctx.Admins.Where(active);

Bad

Where(x=>x.Active && !x.Deleted) repeated

Good

Expression predicate reused

From the same buckets as this rule.

Critical
Avoid Duplicating String Literals
Store repeated string literals in constants or variables to improve maintainability and reduce redundancy.
duplication-complexitymaintainability
Critical
Avoid Redundant `None` Comparisons
Identify cases where `x is None` or `x is not None` is used redundantly when `x` is always or never `None`. This may indicate a deeper logic issue.
duplication-complexityreadability-refactor+1
High
Avoid Functions That Always Return the Same Value
Identify functions that return the same value regardless of input. This may indicate poor design or a logic error.
duplication-complexityreadability-refactor+1